How long ago was that? The NOTAM of no customs is quite recent. Not that I'd be prepared to pay £1000 for the privilege but how does one find out about these special arrangements?
I saw it there a few months ago, well after the well known Customs changes.
However, there is significant "evidence" that people are still flying to some of these airports, direct to/from the UK, with a full encouragement from the airport itself. Not sure I would try it myself.
Also for a biz jet needing customs wouldn't they just go to Le Bourget?
Well, yes...